.btn{
    text-decoration: none;
    border-radius:0.375rem;
    border: 1px solid #e5e5e5;
    display: inline-block;
    background-color: #f8f9fa;
    text-align: center;
    padding:0px;
    color: black;
    font-size: 1rem;
    line-height: 2.625rem;
    width: 100%;
    cursor: pointer;
    outline: none;
}
/*柔和的链接*/
.btn-border-muted {border:1px solid #6c757d; color: #6c757d}
/*主要链接*/
.btn-border-primary {border:1px solid #007bff; color: #007bff;}
/*成功链接*/
.btn-border-success {border:1px solid #28a745; color: #28a745;}
/*信息文本链接*/
.btn-border-info {border:1px solid #17a2b8; color: #17a2b8;}
/*警告链接*/
.btn-border-warning {border:1px solid #ffc107; color: #ffc107;}
/*危险链接*/
.btn-border-danger {border:1px solid #dc3545; color: #dc3545;}
/*副标题链接*/
.btn-border-secondary {border:1px solid #6c757d;color: #6c757d;}
/*深灰色链接*/
.btn-border-dark {border:1px solid #343a40; color: #343a40;}
/*浅灰色链接*/
.btn-border-light {border:1px solid #f8f9fa;color: #f8f9fa;}

.btn-group{
    display: flex; align-items: center;
}
.btn-small{
    height: 2rem; line-height: 2rem;
}